Tesoro Refinery

We regulate water, hazardous waste, and cleanup activities at the Tesoro Refining & Marketing Company in Anacortes.

Facility information

The refinery began operating in 1955. Owned by Marathon and doing business as Tesoro, it processes crude oil into a variety of petroleum products and has about 330 employees and 280 contractors that work on the site.

  • At full production, the refinery has the ability to process 120,000 barrels of crude oil each day.
  • Wastewater from the petroleum-making process is treated and sent to Fidalgo Bay.

Permit information

The Northwest Clean Air Agency regulates the refinery’s air quality activities. Visit the Northwest Clean Air Agency website or call 800-622-4627 for more information.

Tesoro contacts

Company website
Facility phone: 360-428-1617 or 800-622-4627
Location: West March Point Road, Anacortes, Wash.